2 * lib/route/sch/htb.c HTB Qdisc
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
9 * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
10 * Copyright (c) 2005-2006 Petr Gotthard <petr.gotthard@siemens.com>
11 * Copyright (c) 2005-2006 Siemens AG Oesterreich
17 * @defgroup htb Hierachical Token Bucket (HTB)
21 #include <netlink-local.h>
22 #include <netlink-tc.h>
23 #include <netlink/netlink.h>
24 #include <netlink/cache.h>
25 #include <netlink/utils.h>
26 #include <netlink/route/tc.h>
27 #include <netlink/route/qdisc.h>
28 #include <netlink/route/qdisc-modules.h>
29 #include <netlink/route/class.h>
30 #include <netlink/route/class-modules.h>
31 #include <netlink/route/link.h>
32 #include <netlink/route/sch/htb.h>
35 #define SCH_HTB_HAS_RATE2QUANTUM 0x01
36 #define SCH_HTB_HAS_DEFCLS 0x02
38 #define SCH_HTB_HAS_PRIO 0x001
39 #define SCH_HTB_HAS_MTU 0x002
40 #define SCH_HTB_HAS_RATE 0x004
41 #define SCH_HTB_HAS_CEIL 0x008
42 #define SCH_HTB_HAS_RBUFFER 0x010
43 #define SCH_HTB_HAS_CBUFFER 0x020
44 #define SCH_HTB_HAS_QUANTUM 0x040
45 #define SCH_HTB_HAS_OVERHEAD 0x080
46 #define SCH_HTB_HAS_MPU 0x100
49 static inline struct rtnl_htb_qdisc *htb_qdisc(struct rtnl_qdisc *qdisc)
51 if (qdisc->q_subdata == NULL)
52 qdisc->q_subdata = calloc(1, sizeof(struct rtnl_htb_qdisc));
54 return (struct rtnl_htb_qdisc *) qdisc->q_subdata;
57 static struct nla_policy htb_policy[TCA_HTB_MAX+1] = {
58 [TCA_HTB_INIT] = { .minlen = sizeof(struct tc_htb_glob) },
59 [TCA_HTB_PARMS] = { .minlen = sizeof(struct tc_htb_opt) },
62 static int htb_qdisc_msg_parser(struct rtnl_qdisc *qdisc)
65 struct nlattr *tb[TCA_HTB_MAX + 1];
66 struct rtnl_htb_qdisc *d;
68 err = tca_parse(tb, TCA_HTB_MAX, (struct rtnl_tca *) qdisc, htb_policy);
74 if (tb[TCA_HTB_INIT]) {
75 struct tc_htb_glob opts;
77 nla_memcpy(&opts, tb[TCA_HTB_INIT], sizeof(opts));
78 d->qh_rate2quantum = opts.rate2quantum;
79 d->qh_defcls = opts.defcls;
81 d->qh_mask = (SCH_HTB_HAS_RATE2QUANTUM | SCH_HTB_HAS_DEFCLS);
87 static void htb_qdisc_free_data(struct rtnl_qdisc *qdisc)
89 free(qdisc->q_subdata);
92 static inline struct rtnl_htb_class *htb_class(struct rtnl_class *class)
94 if (class->c_subdata == NULL)
95 class->c_subdata = calloc(1, sizeof(struct rtnl_htb_class));
97 return (struct rtnl_htb_class *) class->c_subdata;
100 static int htb_class_msg_parser(struct rtnl_class *class)
103 struct nlattr *tb[TCA_HTB_MAX + 1];
104 struct rtnl_htb_class *d;
106 err = tca_parse(tb, TCA_HTB_MAX, (struct rtnl_tca *) class, htb_policy);
110 d = htb_class(class);
112 if (tb[TCA_HTB_PARMS]) {
113 struct tc_htb_opt opts;
115 nla_memcpy(&opts, tb[TCA_HTB_PARMS], sizeof(opts));
116 d->ch_prio = opts.prio;
117 rtnl_copy_ratespec(&d->ch_rate, &opts.rate);
118 rtnl_copy_ratespec(&d->ch_ceil, &opts.ceil);
119 d->ch_rbuffer = rtnl_tc_calc_bufsize(opts.buffer, opts.rate.rate);
120 d->ch_cbuffer = rtnl_tc_calc_bufsize(opts.cbuffer, opts.ceil.rate);
121 d->ch_quantum = opts.quantum;
122 d->ch_overhead = (opts.rate.mpu >> 8) & 0xff;
123 d->ch_mpu = opts.rate.mpu & 0xff;
125 d->ch_mask = (SCH_HTB_HAS_PRIO | SCH_HTB_HAS_RATE |
126 SCH_HTB_HAS_CEIL | SCH_HTB_HAS_RBUFFER |
127 SCH_HTB_HAS_CBUFFER | SCH_HTB_HAS_QUANTUM |
128 SCH_HTB_HAS_OVERHEAD | SCH_HTB_HAS_MPU);
134 static void htb_class_free_data(struct rtnl_class *class)
136 free(class->c_subdata);
139 static int htb_qdisc_dump_brief(struct rtnl_qdisc *qdisc,
140 struct nl_dump_params *p, int line)
142 struct rtnl_htb_qdisc *d = (struct rtnl_htb_qdisc *) qdisc->q_subdata;
147 if (d->qh_mask & SCH_HTB_HAS_RATE2QUANTUM)
148 dp_dump(p, " r2q %u", d->qh_rate2quantum);
150 if (d->qh_mask & SCH_HTB_HAS_DEFCLS) {
152 dp_dump(p, " default %s",
153 rtnl_tc_handle2str(d->qh_defcls, buf, sizeof(buf)));
160 static int htb_class_dump_brief(struct rtnl_class *class,
161 struct nl_dump_params *p, int line)
163 struct rtnl_htb_class *d = (struct rtnl_htb_class *) class->c_subdata;
168 if (d->ch_mask & SCH_HTB_HAS_RATE) {
172 r = nl_cancel_down_bytes(d->ch_rate.rs_rate, &ru);
173 rbit = nl_cancel_down_bits(d->ch_rate.rs_rate*8, &rubit);
175 dp_dump(p, " rate %.2f%s/s (%.0f%s) log %u",
176 r, ru, rbit, rubit, 1<<d->ch_rate.rs_cell_log);
183 static int htb_class_dump_full(struct rtnl_class *class,
184 struct nl_dump_params *p, int line)
186 struct rtnl_htb_class *d = (struct rtnl_htb_class *) class->c_subdata;
192 if (d->ch_mask & SCH_HTB_HAS_CEIL) {
196 r = nl_cancel_down_bytes(d->ch_ceil.rs_rate, &ru);
197 rbit = nl_cancel_down_bits(d->ch_ceil.rs_rate*8, &rubit);
199 dp_dump(p, " ceil %.2f%s/s (%.0f%s) log %u",
200 r, ru, rbit, rubit, 1<<d->ch_ceil.rs_cell_log);
203 if (d->ch_mask & SCH_HTB_HAS_PRIO)
204 dp_dump(p, " prio %u", d->ch_prio);
206 if (d->ch_mask & SCH_HTB_HAS_MTU)
207 dp_dump(p, " mtu %u", d->ch_mtu);
209 if (d->ch_mask & SCH_HTB_HAS_RBUFFER) {
213 b = nl_cancel_down_bytes(d->ch_rbuffer, &bu);
214 dp_dump(p, " rbuffer %.2f%s", b, bu);
217 if (d->ch_mask & SCH_HTB_HAS_CBUFFER) {
221 b = nl_cancel_down_bytes(d->ch_cbuffer, &bu);
222 dp_dump(p, " cbuffer %.2f%s", b, bu);
225 if (d->ch_mask & SCH_HTB_HAS_QUANTUM)
226 dp_dump(p, " quantum %u", d->ch_quantum);
228 if (d->ch_mask & SCH_HTB_HAS_OVERHEAD)
229 dp_dump(p, " overhead %u", d->ch_overhead);
231 if (d->ch_mask & SCH_HTB_HAS_MPU)
232 dp_dump(p, " mpu %u", d->ch_mpu);
238 static struct nl_msg *htb_qdisc_get_opts(struct rtnl_qdisc *qdisc)
240 struct rtnl_htb_qdisc *d = (struct rtnl_htb_qdisc *) qdisc->q_subdata;
241 struct tc_htb_glob opts;
251 memset(&opts, 0, sizeof(opts));
252 opts.version = TC_HTB_PROTOVER;
254 if (d->qh_mask & SCH_HTB_HAS_RATE2QUANTUM)
255 opts.rate2quantum = d->qh_rate2quantum;
256 if (d->qh_mask & SCH_HTB_HAS_DEFCLS)
257 opts.defcls = d->qh_defcls;
259 nla_put(msg, TCA_HTB_INIT, sizeof(opts), &opts);
264 static uint8_t compute_cell(uint32_t rate, uint32_t mtu)
266 uint8_t cell_log = 0;
275 static struct nl_msg *htb_class_get_opts(struct rtnl_class *class)
277 struct rtnl_htb_class *d = (struct rtnl_htb_class *) class->c_subdata;
278 uint32_t mtu, rtable[RTNL_TC_RTABLE_SIZE], ctable[RTNL_TC_RTABLE_SIZE];
279 struct tc_htb_opt opts;
282 uint8_t overhead = 0, mpu = 0;
288 memset(&opts, 0, sizeof(opts));
290 /* if not set, zero (0) is used as priority */
291 if (d->ch_mask & SCH_HTB_HAS_PRIO)
292 opts.prio = d->ch_prio;
294 if (d->ch_mask & SCH_HTB_HAS_MTU)
297 mtu = 1600; /* eth packet len */
299 if (!(d->ch_mask & SCH_HTB_HAS_RATE))
302 rtnl_rcopy_ratespec(&opts.rate, &d->ch_rate);
303 /* if cell_log not set, compute default value */
304 if (opts.rate.cell_log == UINT8_MAX)
305 opts.rate.cell_log = compute_cell(opts.rate.rate, mtu);
307 /* if not set, configured rate is used as ceil, which implies no borrowing */
308 if (d->ch_mask & SCH_HTB_HAS_CEIL)
309 rtnl_rcopy_ratespec(&opts.ceil, &d->ch_ceil);
311 memcpy(&opts.ceil, &opts.rate, sizeof(struct tc_ratespec));
312 /* if cell_log not set, compute default value */
313 if (opts.ceil.cell_log == UINT8_MAX)
314 opts.ceil.cell_log = compute_cell(opts.ceil.rate, mtu);
316 if (d->ch_mask & SCH_HTB_HAS_RBUFFER)
317 buffer = d->ch_rbuffer;
319 buffer = opts.rate.rate / nl_get_hz() + mtu;
321 opts.buffer = rtnl_tc_calc_txtime(buffer, opts.rate.rate);
323 if (d->ch_mask & SCH_HTB_HAS_CBUFFER)
324 cbuffer = d->ch_cbuffer;
326 cbuffer = opts.ceil.rate / nl_get_hz() + mtu;
328 opts.cbuffer = rtnl_tc_calc_txtime(cbuffer, opts.ceil.rate);
330 if (d->ch_mask & SCH_HTB_HAS_QUANTUM)
331 opts.quantum = d->ch_quantum;
333 if (d->ch_mask & SCH_HTB_HAS_OVERHEAD)
334 overhead = d->ch_overhead;
336 if (d->ch_mask & SCH_HTB_HAS_MPU)
339 opts.rate.mpu = mpu | (overhead << 8);
340 opts.ceil.mpu = mpu | (overhead << 8);
342 nla_put(msg, TCA_HTB_PARMS, sizeof(opts), &opts);
344 rtnl_tc_build_rate_table(rtable, mpu, overhead,
345 1 << opts.rate.cell_log,
347 nla_put(msg, TCA_HTB_RTAB, sizeof(rtable), &rtable);
349 rtnl_tc_build_rate_table(ctable, mpu, overhead,
350 1 << opts.ceil.cell_log,
352 nla_put(msg, TCA_HTB_CTAB, sizeof(ctable), &ctable);
358 * @name Attribute Modifications
362 void rtnl_htb_set_rate2quantum(struct rtnl_qdisc *qdisc, uint32_t rate2quantum)
364 struct rtnl_htb_qdisc *d = htb_qdisc(qdisc);
368 d->qh_rate2quantum = rate2quantum;
369 d->qh_mask |= SCH_HTB_HAS_RATE2QUANTUM;
373 * Set default class of the htb qdisc to the specified value
374 * @arg qdisc qdisc to change
375 * @arg defcls new default class
377 void rtnl_htb_set_defcls(struct rtnl_qdisc *qdisc, uint32_t defcls)
379 struct rtnl_htb_qdisc *d = htb_qdisc(qdisc);
383 d->qh_defcls = defcls;
384 d->qh_mask |= SCH_HTB_HAS_DEFCLS;
387 void rtnl_htb_set_prio(struct rtnl_class *class, uint32_t prio)
389 struct rtnl_htb_class *d = htb_class(class);
394 d->ch_mask |= SCH_HTB_HAS_PRIO;
398 * Set MTU of the data link.
399 * @arg class HTB class to be modified.
400 * @arg mtu New MTU in bytes.
402 * Sets MTU of the data link controlled by the HTB class.
403 * If not set, the Ethernet MTU (1600) is used.
405 void rtnl_htb_set_mtu(struct rtnl_class *class, uint32_t mtu)
407 struct rtnl_htb_class *d = htb_class(class);
412 d->ch_mask |= SCH_HTB_HAS_MTU;
416 * Set rate of HTB class.
417 * @arg class HTB class to be modified.
418 * @arg rate New rate in bytes per second.
420 void rtnl_htb_set_rate(struct rtnl_class *class, uint32_t rate)
422 struct rtnl_htb_class *d = htb_class(class);
426 d->ch_rate.rs_cell_log = UINT8_MAX; /* use default value */
427 d->ch_rate.rs_rate = rate;
428 d->ch_mask |= SCH_HTB_HAS_RATE;
432 * Set ceil of HTB class.
433 * @arg class HTB class to be modified.
434 * @arg ceil New ceil in bytes per second.
436 void rtnl_htb_set_ceil(struct rtnl_class *class, uint32_t ceil)
438 struct rtnl_htb_class *d = htb_class(class);
442 d->ch_ceil.rs_cell_log = UINT8_MAX; /* use default value */
443 d->ch_ceil.rs_rate = ceil;
444 d->ch_mask |= SCH_HTB_HAS_CEIL;
448 * Set size of the rate bucket of HTB class.
449 * @arg class HTB class to be modified.
450 * @arg rbuffer New size in bytes.
452 void rtnl_htb_set_rbuffer(struct rtnl_class *class, uint32_t rbuffer)
454 struct rtnl_htb_class *d = htb_class(class);
458 d->ch_rbuffer = rbuffer;
459 d->ch_mask |= SCH_HTB_HAS_RBUFFER;
463 * Set size of the ceil bucket of HTB class.
464 * @arg class HTB class to be modified.
465 * @arg cbuffer New size in bytes.
467 void rtnl_htb_set_cbuffer(struct rtnl_class *class, uint32_t cbuffer)
469 struct rtnl_htb_class *d = htb_class(class);
473 d->ch_cbuffer = cbuffer;
474 d->ch_mask |= SCH_HTB_HAS_CBUFFER;
478 * Set how much bytes to serve from leaf at once of HTB class {use r2q}.
479 * @arg class HTB class to be modified.
480 * @arg quantum New size in bytes.
482 void rtnl_htb_set_quantum(struct rtnl_class *class, uint32_t quantum)
484 struct rtnl_htb_class *d = htb_class(class);
488 d->ch_quantum = quantum;
489 d->ch_mask |= SCH_HTB_HAS_QUANTUM;
493 * Set per-packet size overhead used in rate computations of HTB class.
494 * @arg class HTB class to be modified.
495 * @arg overhead Size in bytes.
497 void rtnl_htb_set_overhead(struct rtnl_class *class, uint8_t overhead)
499 struct rtnl_htb_class *d = htb_class(class);
503 d->ch_overhead = overhead;
504 d->ch_mask |= SCH_HTB_HAS_OVERHEAD;
508 * Set the minimum packet size used in rate computations of HTB class.
509 * @arg class HTB class to be modified.
510 * @arg mpu Size in bytes.
512 void rtnl_htb_set_mpu(struct rtnl_class *class, uint8_t mpu)
514 struct rtnl_htb_class *d = htb_class(class);
519 d->ch_mask |= SCH_HTB_HAS_MPU;
524 static struct rtnl_qdisc_ops htb_qdisc_ops = {
526 .qo_msg_parser = htb_qdisc_msg_parser,
527 .qo_free_data = htb_qdisc_free_data,
528 .qo_dump[NL_DUMP_BRIEF] = htb_qdisc_dump_brief,
529 .qo_get_opts = htb_qdisc_get_opts,
532 static struct rtnl_class_ops htb_class_ops = {
534 .co_msg_parser = htb_class_msg_parser,
535 .co_free_data = htb_class_free_data,
536 .co_dump[NL_DUMP_BRIEF] = htb_class_dump_brief,
537 .co_dump[NL_DUMP_FULL] = htb_class_dump_full,
538 .co_get_opts = htb_class_get_opts,
541 static void __init htb_init(void)
543 rtnl_qdisc_register(&htb_qdisc_ops);
544 rtnl_class_register(&htb_class_ops);
547 static void __exit htb_exit(void)
549 rtnl_qdisc_unregister(&htb_qdisc_ops);
550 rtnl_class_unregister(&htb_class_ops);